The Forecasting Residual Life of Corroding Pipeline based on Semi-Probabilistic Method
Abstract
In general, the prediction of pipeline residual life can effectively assist pipeline operators to evaluate future safe operating strategies including re-inspection and appropriate maintenance schedule. As a result it can minimize the possibility of pipeline failures until it reaches its designed lifetime. A semi-probabilistic methodology for predicting the remaining strength of submarine pipelines subjected to internal corrosion based on Recommended Practice RP-F101 by Det Norske Veritas (DNV) is described in this paper. It is used to estimate the maximum allowable operating pressure of the corroding pipelines based on series of pigging data, which represents corrosion pit location and dimension. The introduction of partial safety factors in the DNV code to minimise the effect of uncertainties due to the defect sizing has improved the reliability of pipeline assessment methodology. Nevertheless, the code is still regarded as a fully deterministic approach due to its incapability of predicting the remaining life of corroded pipeline. Thus, we have added prediction capabilities to the capacity equation by introducing a standard deviation model of future defect depth. By doing so, the variation of safety factors of the capacity equation can be fully manipulated in which prediction of future pipeline residual life becomes feasible. The paper demonstrates calculation and prediction of pipeline residual life subjects to internal corrosion. The results shows the standard deviation of corrosion parameter affected the value of partial safety factor as corrosion progressing, hence amplify the conservatism of time to failure.
References
Teixera, A.P., Guedes Soares, C., Netto, T.A., Estefen S.F. (2008). "Reliability of pipeline with corrosion defects." International Journal of Pressure Vessels and Piping. 85. 228 - 237.
https://doi.org/10.1016/j.ijpvp.2007.09.002
Ahammed, M. (1998). "Probabilistic Estimation of Remaining Life of a Pipeline in the Presence of Active Corrosion Defects." International Journal of Pressure Vessels and Piping. 75. 321-329.
https://doi.org/10.1016/S0308-0161(98)00006-4
Netto, T.A., Ferraz U.S., Estefen S.F., (2005). "The effect of corrosion defects on the burst pressure of pipelines." Journal of Constructional Steel Research. 61, 1185-1204.
https://doi.org/10.1016/j.jcsr.2005.02.010
Ahammed, M. and Melchers, R.E. (1996). "Reliability Estimation of Pressurised Pipelines Subject to Localised Corrosion Defects." International Journal of Pressure Vessels and Piping. 69. 267-272.
https://doi.org/10.1016/0308-0161(96)00009-9
Ainouche, A. (2006). "Future Integrity Management Strategy of a Gas Pipeline Uisng Bayesian Risk Analysis." 23rd World GAS Conference.5 - 9 June. Amsterdam, Netherlands:3.3EF.05.
Yahaya, N. (2000). "Risk -Based Method in Pipeline Maintenance Optimisation." Hanover, Germany: Proceeding of the Global Dialogue World Exposition (EXPO2000). Science and Technology, Thinking the future. July 11-13
Yahaya, N., Noor, N.M., Din, M.M., Nor, S.H.M., (2009). "Prediction of Co2 Corrosion Growth in Submarine Pipelines" Malaysian Journal of Civil Engineering 21(1) : 69 - 81
Cosham A. and Hopkins P., "The assessment of corrosion in pipelines - Guidance in the pipeline defect assessment manual (PDAM)," International Colloquium Reliability of High Pressure Steel Pipelines, pp 1-30, 2003
Cosham, A., Hopkins, P., Macdonald, K.A. (2007). Best practice for the assessment of defects in pipelines - Corrosion. Engineering Failure Analysis. 14. 1245 - 1265.
https://doi.org/10.1016/j.engfailanal.2006.11.035
Bjornoy, O.H. and Marley, M.J. (2001). "Assessment of Corroded Pipelines , Past, Present and Future." Stavanger, Norway: ISOPE 2001, Proceedings of the 11th International Offshore and Polar Engineering Conference. June 17-22. Vol II. 93-101.
DNV (Det Norske Veritas) (2004). "Recommended Practice RP-F101 for Corroded Pipelines 2004." Norway: Det Norske Veritas.
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